[Insight-users] Geodesic Active Contour and Fast marching Runtime Error

[Luis Ibanez]

Hi Jordan,

Yes, you can create the MetaImage header with any
text editor. (for example the Windows Notepad).

Make sure that you add the spacing information.
ElementSpacing is an alias for pixel spacing.
The tags were originaly intended to represent
independently the two conceps:

   - Slice thickness
   - Pixel spacing

but it turned out than in practice almost no algorithm
uses the slice thickness, only the pixel spacing.

Another way of creating the MetaImage header is to
use the application MetaImageImporter in  InsightApplications.


  Regards,


    Luis




------------------
a a wrote:

> hi Luis,
>  
> thanks for the reply
> yah that was what i thought initially after i tried out the 2D curves 
> extractor successfully,
> i tried the itkDicomSeries reader/writer to read a series and created a 
> volume image but the GAC and Fast March apps did not work, maybe the 
> problem lies in the volume image file created(since the images are in 
> time series)
>  Can i just use notepad to create a meta image header for a volume and 
> try again with GAC and Fast Marching (since i know which images form 
> each volume, but do i have to include the slice thickness, Image 
> orientation position, Image orientation etc. if the images that form one 
> volume have the same size, slice thickness, and orientation.) Also, what 
> should i input for the 3rd parameter of the Element Spacing actually 
> mean, is it the the spacing between each image slice, or the slice 
> thickness. Thanks again
>  
> regards
> jordan 
>  
> 
> */Luis Ibanez <luis.ibanez at kitware.com>/* wrote:
> 
>     Hi Jordan,
> 
>     These applications require the images to be 3D volumes
>     and to have at least 4 pixels along every dimension.
> 
>     It is likely that the images you are feeding to these
>     application didn't match one of those criteria.
> 
>     Please let us know,
> 
> 
>     Thanks
> 
> 
>     Luis
> 
> 
>     ------------------
>     a a wrote:
> 
>      > Hi all,
>      >
>      > i read a MRI image using the meta header, with the
>     GeodesicActiveContour
>      > and FastMarchingLevelSet applications (from Insight Applications
>      > 1.40). i was able to display the image using the "display" button
>     but
>      > whenever i click on the other buttons such as "Gradient
>      > magnitude", "Linear Sigmoid", "Fast marching", etc., the progress
>     bar
>      > will start running and get stuck halfway, and these 2 applications
>      > will run dead with the error:
>      > The institut! ion at "0xffffffff" referenced at "0xffffffff". The
>     memory
>      > could not be "read".
>      >
>      > Can anyone tell me what's going on, i've rebuilt the Applications
>     twice
>      > and they'r still the same.
>      > Thanks
>      > Regards
>      > jordan
>      >
> 
> 
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